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@EarthOrgUK Good report. Might be worth explaining that they only measure apparent power (VA)which will be higher than the actual house load. When you get to low loads this is significant - a typical smoke detector draws 10-20VA which will show up in the readings.
@X31Andy Would you like to suggest some actual words (or I can adapt these) to add as a comment?
@X31Andy If you're happy with what I've put up then we're done, and thanks! Else new words welcome!
https://www.earth.org.uk/note-on-clip-on-power-meters-for-the-UK-REVIEW.html#Apparent
@EarthOrgUK Probably a note that they can read slightly "high" for some loads like smoke detectors and LED lights.
I think a full discussion on power factor etc would scare a lot of people off :) I do like the article though.
I'm off-grid so monitor load very carefully. My minimum idle is about 40W, 7W being the small inverter and about 15W being the smoke detector (the inverter really doesn't like the poor power factor).
@X31Andy Yes, one case years ago someone was telling me that their (early) LED lighting was being over-reported by x3 which caused a little panic!